Prometheus is an open-source monitoring and time-series database for collecting metrics, querying with PromQL, and alerting on system and application health.

65.8k stars10.8k forksApache-2.0last commit Actively maintained
Honeycomb is a cloud observability platform for high-cardinality distributed tracing, event-based metrics and traces. It provides fast ad-hoc querying, visualization and analysis of production telemetry to investigate incidents and debug performance.
Prometheus is an open-source monitoring and time-series database for collecting metrics, querying with PromQL, and alerting on system and application health.

65.8k stars10.8k forksApache-2.0last commit Actively maintained
Sentry is a developer-focused platform for error tracking, performance monitoring, and tracing to help teams detect, investigate, and fix issues faster.

44.6k stars4.8k forkslast commit Actively maintained
SigNoz is an open-source platform that collects and correlates logs, metrics, and traces using OpenTelemetry for unified observability.

31.9k stars2.4k forkslast commit Actively maintained
Parseable ingests, analyzes, and extracts insights from MELT telemetry data with predictive analytics and a unified SQL/NL querying interface.

2.4k stars171 forksAGPL-3.0last commit Actively maintained
Every option on this page is open source and free to run on your own hardware, so you own the data and there is no subscription to cancel. 4 of 4 shipped a commit in the last six months. Licences in this list: Apache-2.0, AGPL-3.0. In exchange you take on hosting, backups and updates yourself.
Browse everything in Monitoring & Observability.